I packaged all of this up into an actual Heimdall Firmware Package (not sure why this wasn't done from the beginning) that I can verify works with Version 1.3.2 of the Heimdall frontend. Firmware can be found here:
https://docs.google.com/open?id=0By5pF101cmHZN21mUTNwUDhiRUU .
Plug device directly into an onboard (i.e. not through a hub) USB port on your computer after putting it into download mode (hold vol down + power to boot).
Run zadig.exe from the Heimdall Drivers folder as Administrator.
In the Zadig Options menu select List all devices.
In the device drop down list select Samsung USB Composite Device.
Zadig should look like this
View attachment 50377
Click Replace Driver (or Reinstall Driver if that's what the buttons says)
Close Zadig and then run heimdall-frontend.exe as Administrator.
On the Load Package tab under Heimdall Firmware Package click Browse and select the Firmware you downloaded from the link above.
Click on the Load / Customize button in the bottom right.
Navigate to the Flash Tab which should now have files listed under Partitions and look like this:
View attachment 50378
Click the Start button in the lower right corner.
After Flashing you may have to boot into recovery mode and do a factory reset although I personally didn't have to do (hold vol up +power to boot into recovery and then select wipe device / factory reset)
Boot normally, to bypass the Verizon Activation if you just want to use Wifi you can do the following, press VolUp, VolDown, VolDown, VolUp, VolUp, VolUp, VolDown, VolDown, VolDown, VolDown (seriously, this actually works)